Do these ink cartridges fit the Amazon Basic fountain pen?

NO, they most definitely do not. The ones that DO fit the Amazon Basics fountain pen are these: https://www.amazon.com/Refillable-Cartridges-International-Calligraphy-Rollerball/dp/B07D43QR17/ref=psdc_1069832_t2_B08259HPC7 I have tested those and they are what I'm using right now in my pen.

Are these the correct cartridges for Hongdian extra-fine (4mm) pen? They were linked to by Amazon, but after installing, no ink coming out.

Yes, The hongdian cartridges work with Hongdian fountain pen. If there is no ink comeing out, you can follow the instructtion below: 1) Soak the nib part in warm water for five minutes ,Reassemble the pen after cleaning, and test ink flow. If this doesn't help, try the next step. 2) Press the nib on the paper to make it spread a little, then it will flow properly. If it does not work, please send us a message.

How much fluid is in each cartridge?

They are the .5ML ones basically the small ones, it is great ink for the price it does it’s job and it’s dark enough when writing, you will enjoy🤙🏾

Will this fit Picasso 902 fountain pen?

Sorr, they do not fit picasso fountain pen. For picasso fountain pen, you can purchase jinhao cartridges for it.

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Hongdian Cartridges

Product ID: 172094317

Details

Brand
Asvine
Item Weight
0.09 kg
Number of Pieces
30
Point Type
Chisel
Style
Fountain

💧quick-dry ink flow

⚙️3.4mm bore precision

🖋️30-pack bulk refill

$U966

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Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖋️ Elevate your pen game—never run dry on brilliance!

SMUDGE FREE SPEED - Quick-drying ink ensures your notes and signatures stay crisp and professional.
BULK INK POWERHOUSE - 30 premium black cartridges to keep your creativity flowing without pause.
CLEAN SAFE FORMULA - Neutral pH, non-toxic natural dyes protect your pen and your health.
EFFORTLESS WRITING FLOW - Smooth, uninterrupted ink delivery that transforms every stroke into a statement.
PRECISION FIT GUARANTEED - 3.4mm bore diameter engineered for seamless compatibility with select fountain pens like Hongdian.

Asvine’s set of 30 black ink cartridges features a precise 3.4mm bore diameter designed for compatible fountain pens, delivering smooth, quick-drying, and non-toxic ink that ensures a flawless writing experience every time.

Specifications

ASIN	B08259HPC7
Best Sellers Rank	#2,938 in Office Products ( See Top 100 in Office Products ) #10 in Ink Pen Refills
Brand Name	Asvine
Customer Reviews	4.5 4.5 out of 5 stars (12,183)
Ink Color	Black
Item Weight	0.09 kg
Manufacturer	Hongdian
Manufacturer Part Number	HDBI608F7
Model Number	HDBI608F7
Number of Pieces	30
Point Type	Chisel
Style	Fountain
Unit Count	30 Count

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$U966

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Uruguay.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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